clc
I1=0.185;
I2=0.187;
y=1.4;
pi1=3.14;
K=4/25*(2*pi1*I1+4*pi1*I2/(y*(y-1)))
% K=0.856
1/K
log10E=log10(K*1.25)+2*6.908
E1=10^(2*6.908)*1.25/1.1669
E=10^log10E
E/(4.25*10^9)
E/(4.18*10^9)
